parents (G,v)
The parents of v are the all the vertices u such that u,v is in the directed edge set of the MixedGraph G. So the parents of a vertex v are exactly those vertices of the largest digraph component of a mixed graph that point to v.
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The source of this document is in /build/reproducible-path/macaulay2-1.25.06+ds/M2/Macaulay2/packages/StatGraphs.m2:1132:0.